Many of the brokerage companies have them on their websites as well. Fidelity, Schwab, TD Ameritrade and BankRate come to mind.

AARP--i had to buy a membership to get $10/month off my Medicare Supplement...still not a believer in them, but it saved me a net $100/year on that. Checked their travel deals for a recent trip--did much better at hotels.com and car rental through Southwest Air's site. Probably would have cost an extra $250-$300 on a 4 day trip to use AARP.